A Sash Sawmill Glossary

Terms used to describe parts and processes in a sash-type sawmill. Some of the specialized terms (eg., ragwheel) seem to have been generally accepted and appear in many 19th century texts (although with variations in spelling); it seems reasonable to conclude they would have been common usage. Others appear infrequently in the writings we have reviewed and it is difficult to know about actual usage by sawyers, mill-men, and millwrights in workday conversation. Additional research of extant sawmill daybooks, account books, and sawyer's diaries would be of great help. Some of the terms included here are not specifically related to sawmills, but are more widely applicable. My personal preference for the specialized mill terms has been to rely on Ellicott and Craik (see 19th century references on sash sawmills) as the key authorities, perhaps because these references are the most complete and are written by sawmillers/millwrights.
We have included URLs in some of the definitions that link directly to the source texts, but also see 19th Century References on Sash Sawmills on this website for other relevant 19th Century texts.     We welcome comments or additions to this list. Please email us at info@ledyardsawmill.org
     
 
 Bail dogs
A typical method of fastening the log to the log carriage. The iron dogs are mounted to the head block and tail block of the carriage with eye bolts to swivel – a blow from a hammer or the end of the mill bar drives the teeth of the dog into the end of the log. The name likely comes from the similarity to a bail on a bucket – the swiveling handle that is attached at the rim.

There are a pair of bail dogs on the headblock: The saw needs to start in front of the log prior to the cut and fits in a notch cut into the headstock. The tail block typically has a single dog; the sawcut is stopped prior to the saw reaching the very end of the log; therefore the saw does not enter the tailstock and there is no need for a two part dog. (The double dogs on the tailblock at the Ledyard mill perhaps indicate that they started life as headblock dogs on a different carriage.)

See also dogs
 

Pictures coming soon!
 Bull wheel A water wheel that supplies power to haul logs into the mill. Also pull wheel. Craik, p. 207. Usually was tub wheel (Whitham p. 57)  
 Cant hook A 4-5 foot long wood lever with a hinged iron spike to grab and turn over a log on the ground. (A cant is a log that has been sawn on two or more sides.) Also can-hook. See also peavey.  
 Carriage  See log carriage  

 Churning
 Operate saw without advancing the log carriage in order to clear sawdust from the kerf. Parsons (p 15) recommends churning when sawing a large logs for which the saw stroke is shorter than the thickness of the log.  
 Connecting bar See evener  
 
 Dogs
A straight or curved iron spike driven into a log or timber. On a sash sawmill, there typically are dogs are attached to both the head block and tail block.

Bail-dogs are one type of dog, but there are many others: straight spikes let into grooves or going through the body of the head or tail block; straight dogs fastened onto metal plates which are fixed to the blocks. The common theme for the dogs on the log carriage is that they are fixed into the end of the log to hold it.

Spons dictionary (1871) has a vivid description: “an iron with fangs for fastening a log in a saw-pit, or on the carriage of a saw-mill.” see bail dogs
 
 Double mill  Or double sawmill. Two independent and complete saw mechanisms in a single building  

 Drop
 A long vertical wooden weight attached to the pawl that drives the rag wheel.  When the lower end of the drop stands on the floor, the pawls engage the rag wheel and the log carriage can move.  When the drop is placed down in a hole in the floor, the pawls are raised up and not engaged in the ratchet of the rag wheel.  From Craik, page 202.  

 English Gate
 The term used by Craik and others for a sash-type sawmill. Refers to the likeness of the saw frame to a square-framed gate. The 19th century usage of “English gate” seems to have been primarily in Pennsylvania and north through New York to Canada, but not in New England.

Sawmill enthusiast Marilyn Hatch suggests “English Gate” came from the walled cities where the entry ways had gates which went up to open and down to close.
 

Evener
 Craik’s (p. 198) term for the lever that moves the rag wheel. The evener is moved by the connecting bar. On many sash sawmills, the function of the evener and connecting bar are performed by one piece of wood, the feeder.
See figure for other terminology from the Thomas Ellicott chapter on sawmills in Evans.
 
 Feeder  The wood pole attached to the rocker that pushes the rag wheel (Ellicott, p 80). Also called hand-pole; feed bar.  
 Feed pole  Craik’s term for the wood pole that translates vertical movement of the saw sash to the rocker. (Craik p.197).  In other writings called a sweep.  
 Fender beam and sill  The main beams above (beam) and below (sill) the saw frame. See fender post.  

 Fender post
 The massive vertical wooden posts attached to the mill structure that support and guide the saw frame in a sash-type sawmill. The tops of the fender post is attached to the fender beam; the bottoms are supported by the fender sill – these joints are made tight with wedges to allow adjustment of the fender posts to plumb.  see Ellicott, p. 82; Craik, p. 179.  
 Flash boards  Planks set across a spillway to adjust the water level behind a mill dam. From Woodbury, John Goffe’s Mill  
 Flume  A channel directing water to a waterwheel or turbine.  

 Flutter wheel
 A type of undershot water wheel which was the typical water wheel used in 18th and early 19th century sash sawmills. Ellicott (pp. 77-78) has a table recommending flutter wheels sized for different heads of water. 

See plate XXXIX in Frizzell following p 240Emerson, p 45.  There is a copy of a photo of a flutter wheel in Ledyard Connecticut shown in a paper by Edward Hamilton of Old Sturbridge Village.   Would love to know where the photo was taken, but the information is not known by the current staff of OSV.

Note that there is some misinformation in a couple of early 20th century mill writings – eg., Hiscox p 132 labels a horizontal gig back wheel as a flutter wheel – This (likely) mislabeling is also found in Safford and Hamilton figures 5 and 6.

 

 Flywheel
A heavy wheel on shaft that maintains inertia of the rotary motion of the shaft. On the Ledyard mill, a crank on the iron flywheel is connected to the saw frame by the pitman arm. The flywheel and crank therefore transfer rotary motion to up and down motion of the saw frame, but also help maintain the motion by virtue of the heavy weight of the flywheel (which we estimate to be about 600 lbs.)  
 Frame saw  See sash saw  
 Friction rod  Vertical iron guides fastened to the fender posts upon which the saw frame rides. The friction rods in the Ledyard mill are round lengths of iron about 2 inches in diameter, but friction rods are square on some mills. (Craik, p. 196). Also called guide rods, slide rods, or slides.
The four wooden bearings on the saw frame that hold the frame to the friction rods are called “boxes” by Craik (p. 196).
 
 Gang saw A sash or frame sawmill that uses multiple straight blades to make many cuts in a single pass.

See also Craik for discussion of Yankee gang. A live gang cuts a log through without previous squaring or slabbing. English gang, yankee gang are slightly different [ Knight’s]
 

 Gigging back
Moving the log carriage in reverse after a cut is made the length of the log. On some sash sawmills, the power is provided by a separate gigging (or go-back) waterwheel (Craik p. 203). The gig wheel was frequently a tub-wheel – a simple horizontal wheel enclosed in a round wood tub.  

 Gudgeon
An iron insert in the end of a wooden shaft that is supported by a bearing. A typical wooden shaft in a mill has iron gudgeons on the ends which will not wear out as rapidly as wood. Some gudgeons have wings that insert into the end of the wooden shaft.  

 Gullet
 The space between saw teeth. The size of the gullet needs to be large enough to carry away sawdust during each cut or the kerf will jam with sawdust. Several 19th century mechanical dictionaries (including Knight’s 1877 vol III, p 2036) use the rather urbane phrase “interdental spaces”.  

 Gum
 Gumming refers to enlarging a saw gullet. Typically done with a metal punch, file, or a cutting or abrasive wheel. A large gullet is important so as to carry the sawdust out of the kerf while the saw is cutting.  

 Hand
 The iron pawl that fits over the ratchets on the ragwheel and imparts motion to the rag wheel (which in turn moves the log carriage). Ellicott p. 80, Craik.

Also see J Franklin Inst, 1829 vol 69 p 195
 

 Head block
 The primary definition as relating to sash sawmills is the forward support for the log on a log carriage. There is a slot in the head block in which the saw rests in front of the log prior to the cut. It is typical for the head block to be adjustable for the length of the log (with the tail block fixed on the carriage.) Somewhat unusually, perhaps, both the head block and tail block on the Ledyard mill log carriage are adjustable. In practice at the Ledyard sawmill, we move the tail block to adjust for the length of the log.

Also called headstock.

There is another mill-related definition: the support for the end of a shaft This usage applies to various mill types, not just sawmills.
 
 Hand-pole  See feeder. From Ellicott.    
 Head sawyer  The sawyer working at the head stock (or head block) end of the saw carriage. His partner was the tail sawyer  
 Head gate  The main gate controlling the flow of water from the head-race or pond to the water channel that supplies the mill penstock or tank. (Craik, p. 185). Also control gate, sluice gate, flume gate.  
 Head race  The upstream water channel from the pond that directs water into the mill. The downstream channel is the tail race.  
 Hook pin  Described (but not named) by Ellicott to hold the saw frame to the fender posts. Called hook pins by Chase (p. 222).    
 Hook tenon  The tenon at the top of the fender posts that fits into a mortise in the top of the fender beam. This joint is adjustable by means of wedges so that the fender posts can be adjusted to plumb. Craik p. 197.  Ellicott (p. 82) simply says the fender posts are"hung by hooked tenons".  

 Kerf
 The slit made in a log or board after cutting with a saw. The kerf made by the mill saws we use in the Ledyard sawmill is about ¼ inch. More set will result in a wider kerf (more work for the saw, more of the log converted to sawdust and shavings)  
 Lever  A general term, but used specifically in Ellicott to refer to the sweep. See sweep.  
 Log carriage  The movable wood frame that rides on guides on the mill floor and supports the log to be sawn.  Moves forward with each upstroke of the saw.  

 Lug-pin
 Pin slipped through hole in the saw that is held by the stirrups on the saw frame. Interestingly called tug pins by Ellicott in Evans first edition, but changed to lug-pins in later editions. Grimshaw also uses “tug-pin” (in supplement in 1882 2nd edition supplement, p. 216).  
 Mill bar  Long iron pry bar used to move logs and also to hammer in the dogs on each end of the log as it sits on the log carriage.

"The largest log could easily be moved sidewise by means of a mill bar, which was a heavy iron bar four feet long, flattened and curved at one end. Using this as a lever to raise the log, it could be easily placed in the proper position"

For using a mill bar see also Centennial History of Oconto County, also Craik (pp 210, 224), Frizzell (p 243).
 
 Mill race  A water channel directing water to or away from a mill. See head-race or tailrace. Also called sluice.  
 Mill saw  In 19th century writings “mill saw” usually refers to a straight saw blade used in up-down, muley, or gang saws. Also called straight saw or long saw. (Also mill web saw which usually refers to multiple straight blades used in a gang saw).

Often without the space so as to be one word:  millsaw.
 
 Mill-seat  The site upon which a mill is located  

 Muley saw
 A type of up-down saw, but the saw itself is not hung in a frame. Rather, the straight saw blade slides between wood guides at the top and bottom. Muley saw blades are made from a heavier gauge steel than sash sawmill blades.

The 19th century lumber industry historian George Hotchkiss outlines two proposals for the origin of the term. One is that the name comes from the German mühl-sage, or mill saw. This seems plausible, however the the conventional history is that the muley saw was an American, not continental, development in water-powered sawmill technology*. Further, straight mill saw blades were in use in sash type saws for several hundred years prior to the invention of the muley saw: the differentiating feature in the muley saw is not the mill saw blade.

The second proposal is that it comes from that fact that a muley saw does not have a frame and is therefore “hornless”. (Encyclopedia Britannica, 1888. Vol 21. G. W. Hotchkiss, Entry on Saws, p. 343. ) The horns of a sash saw refer to the sides of the saw frame that project up past the top crosspiece. An old term for cows without horns is a muley (also mooley or moiley). A 19th century Dictionary of Americanisms specifies that this was a common term in New England. (Interesting to note that this text specifies that muley saw comes from mühl-sage.) A story (perhaps apocryphal) that has all the details of the muley cow theory can be found in a book by George W. Hotchkiss, the same author as the Encyclopedia Britannica article. G.W. Hotchkiss, History of the Lumber and Forest Industry of the Northwest (1898) p. 656.

Also spelled mulay; mullay, mully, mulley (Craik p 190); moiley, muhley (which perhaps supports the muhl-sage theory), mooly.

*The conventional history, of course, may be wrong for the invention and use of a muley-type up-down saw.  See Bélidor listing in 19th Century references on this website.  A 1777 drawing in a London publication appears to show a muley saw -  decades earlier than the typical date range of 1825-1850 for the invention and popularization discussed in sawmill literature. 

 
 Noddle pin From Craik p 195. Pin on the bottom of the saw frame to which the pitman is attached  

 Nog
 One in a series of short perpendicular boards lined up along the length of the mill upon which the log carriage is guided. Chase p 222. Also used as a more general term for a wood block or peg, or blocking in walls.  

 Parbuckling
 To roll a log by looping one or more ropes or cables around the log. One end of the rope is fixed and the log can be moved by pulling the other end of the rope. More generally, a method to move something round (a log, cask, or cannon) up an inclined ramp.  

 Pawl
 An iron bar that fits in the notches in a ratchet to move the ratchet forward or prevent backward motion. A common use in sash sawmills for the feed mechanism that pushes the rag wheel and therefore the saw carriage forward.  
 Peavey  Similar to a cant hook, but with a steel spike (or pike) on the lower end. Named after inventor Joseph Peavey.  
 Penstock  A water channel, tank, or tube leading to the water power source (water wheel or turbine). The term penstock is typically used for an enclosed channel. A related term is flume which usually designates a wooden water channel above ground or supported by scaffolding.    

 Pillow block
 A pillow is a bearing for a shaft. The pillow is fixed to a cast iron block that is therefore the pillow block. Also called plumb block; plumber block; plummer block. Pillows are sometimes referred to as brasses if that is the bearing material. Buchanan, Practical Essays… p. 344  
 Pitman  The connection from the crank on the waterwheel or flywheel to the saw frame. Analogous to the literal “pit man” on the bottom of a two man pit saw crew. Sometimes spelled pittman.  Ellicott's description is on p. 83; Craik's description with measurements is on p. 193.  
 Privilege  Relates to water privilege – the rights and restrictions to damming and using water in a stream or river.  
 Race  See mill race  
 Rack and pinion  Two toothed gears that mesh – one straight and one round. Typically used to convert rotary to linear motion.  

 Rake
 A general term meaning that an object is at angle, but used specifically in sash sawmills to refer to the forward tilt of the mill saw in the direction of the tailstock. The top of the blade is slightly forward (3/8 to 3/4 inches) of the bottom of the blade. The proper amount of rake is critical for efficient sawing: after the downward cutting stroke, the teeth of the saw must be clear of the log as the saw frame goes up and the log moves forward. Stated best by Evans: “…this is to give the saw liberty to rise without cutting; and the log room to push forward as it rises.” (The Young Millwright & Miller’s Guide, 1795. part the Fifth, article 40, p. 90)

the saw has what is called the “rake”, that is the line of the teeth is diagonal with the motion of the saw

“The forward inclination of a mill-saw.” An American dictionary of the English Language, Webster et al., 1846.

Perhaps related to use as a nautical term referring to the tilt or angle of a mast or stern. Also called lead; overhang (Parsons, p 14).
 

 Ragwheel
 The feed wheel for the log carriage. The wheel the moves the log carriage – the ratchet notches on the outside of the ragwheel transfer the movement of the feed pole to the log carriage. On many ragwheels there are two sets of ratchets – one on the circumference for log carriage advance, and a second on the outside flat face for gigging back. Ragwheels that lack the second ratchet system don’t have a system for powering the carriage return, rather there is a series of wood pegs protruding from the outside of the wheel. The sawyer thus can step on the pegs and walk the carriage back. Craik uses a different spelling – wrag wheel (e.g., see p 197) – and calls the iron ratchet on the circumference the wrag iron (p. 219). The "wrag" spelling appears in various contemporary stirrings and websites - I suspect that Craik is the original source of this particular spelling.
Ellicott describes a ragwheel on p. 80.
Also called a ratchet wheel or rack wheel.  The term ragwheel may be a derivation of ratchet wheel; interestingly, there are definitions of both terms in the 1825 Science of Mechanics.
 
 Ribbons  Craik p. 198 used this to refer to a track (made from wood or iron) upon which the log carriage is guided.  
 Rip  To saw in the direction of the grain of a log or board. In contrast to cross-cutting which is across the grain. When sawing a log into boards on a sash sawmill, we are ripping the log into boards.  
 Rocker   Term in Craik (p. 197) for the shaft that translates up and down sash movement to horizontal movement of the feeder (hand-pole). Called a roller by Ellicott (p. 80).  
 Round  Cogs on ragwheel shaft that engage the cog (mortise) on the log carriage  

 Ruffage board
Next to the slabs were usually one or two-way bark-edged, or sappy boards, which were called ruffage boards. These were piled by themselves.  Jamestown Post-Journal
http://www.jstor.org/pss/27571842
 
 Saw gate  See sash saw. The wood frame that supports the saw and moves up and done during sawing in a sash-type sawmill. See also English gate.  

 Sawmill irons
 Or mill irons.  Quite literally the iron parts of a sash sawmill. Includes the stirrups, dogs, crank, pitman connectors, shaft gudgeons ragwheel pieces, etc.

Refs include G Vail catalog pp 11-15 and Geneological [sic] and historical sketch of the Ross family.

 

 Sash saw
 The general name for a sawmill like the Ledyard mill. Named for the fact that a single straight saw blade is held inside a wood sash (or frame) that is driven up and down by the mill. The saw is said to be hung, or stretched, in the sash frame.  See Types of Sawmills on this website.

The term was not needed prior to the advent and then widespread use of circular and bandsaws in the middle of the 19th century and later. All early sawmills were sash-type, so they were simply called sawmills.

Also called gate saw, English gate, up-down or up-and-down saw, upright saw, frame saw.  Not to be confused with an additional usage: a small handsaw or manufactury used to trim or mill components for window sashes.
 
 Set  As in “saw set”. Refers to each saw tooth being bent out to the side so that the slit that is cut by the saw (the kerf) is wider than the blade. The blade is less likely therefore to bind in the kerf as sawing progresses.  
 Slides   See friction rod.  

 Sluice 
 A pipe or channel that drains the millpond when opened. Opened or closed with sluice gate so the pond level can be lowered to allow maintenance of the mill or dam. The term is also occasionally used (probably incorrectly) to apply to the headrace. Sometimes used interchangeably with flume – a raised wooden channel for water.  
 Stirrup  The looped metal supports attached to saw frame at bottom and top that are the mounts for the saw. Called staples by Ellicott, p. 82.  

 Stub shot
 The end of a log supported by the tailstock and which is not cut through by the saw. The presence of the broken-off stub shot is an obvious signature of a board from a sash sawmill.
Also called stub short, stump shot.
 

 Swage
 A V-shaped metal punch used to straighten and re-form the worn tip of a saw tooth. Other names for this tool are upset (Disston 1876, Craik, p. 213) or jumper ( Disston 1876; “Canadians and Americans jump their saws” Blackmur, Sawmill Work and Practice, p. 9), and the wince-inducing name “crotch punch”.
Usually pronounced (and occasionally spelled) “swedge”.  
 
 Sweep  The wood bar attached to the top of the saw sash (frame) that imparts the movement of the frame to the rocker (roller). Also called a lever by Ellicott (p. 80).  

 Tail block
 The crosspiece support on a log carriage which carriage the end of the log furthest from the saw. The tail block can be moved on the Ledyard mill to accommodate different length logs (more commonly the tail block was fixed and the head block was instead adjusted).
Also called tailstock; hinder head block (Forman p 113); hind-most head block (Ellicott)
 
 Tailrace  The water channel exiting the mill. Directs the water that has already passed through the waterwheel or turbine out of the mill.  
 Tail sawyer  The sawyer working at the tail block end of the log carriage.   
 Trash screen  A screen or grate located in the headrace that prevents debris in the pond from entering the penstock and fouling the turbine or water wheel. Also called trash rack.  
 Tub wheel  See gigging back  
 Tumbling vent  A spillway that regulates the pond level. Accommodates overflow of a mill dam by preventing breaching of the entire dam by high water levels. From Woodbury, John Goffe’s Mill  

 Turbine
 A shaft with rotor blades inside a case (typically fabricated from cast iron). Water entering into the case forces the rotor and its shaft to turn to power the mill. Turbines came into use around 1830-1840 in Europe and then were introduced into the U.S. Gradually replaced wood water wheels in small sawmills over the next 30-40 years (and then were in turn were replaced by steam power).
The Ledyard sawmill is powered by a scroll-type turbine made by John Tyler
 

 Up-down sawmill
 Also called frame saw, sash saw, gate saw, English Gate (by Craik). Muley saws and gang saws are also a type of up and down saws; that is, they have straight saw blades that reciprocate vertically to cut.
See sash saw.
 

 Water wheel
Overshot
Breast wheel
Undershot
Flutter wheel
Reaction wheel
Rose wheel
 
 Whet  To sharpen the saw with a file. The similarity of the call to filing, or whetting a saw is, of course, the origin of the name for the saw-whet owl.