NOTE FULL LINE OF HAND REAMERS IN METRIC UNITS.

Our reamers are made with eccentric flutes and are slightly tapered on end to facilitate entering work.

Specify all tools by our list numbers.

58

A LINE OF METRIC CUTTERS FOR CUTTING THE TEETH OF GEAR WHEELS ACCORDING TO THE METRIC SYSTEM.

PATENT METRIC INVOLUTE CUTTERS FOR TEETH OF GEAR WHEELS.

We are prepared to furnish, at short notice, cutters for cutting the teeth of gear wheels according to the metric system.

Module is the pitch diameter in millimetres divided by the number of teeth in the gear.

Pitch diameter in millimetres is the module multiplied by the number of teeth in

the gear.

M=module.

N=No. of teeth in gear.
For example: M=3.50 mm; N=100;

D'-pitch diameter in mm.
D'=MXN.

D=3.50X100=350 mm.

NOTE CONTINUED REFERENCE TO CUSTOMARY AND METRIC UNITS ON A SIMILAR BASIS OF AVAILABILITY.

[From a well-known catalogue of measuring instruments.]

These gauges are made of steel, specially hardened and treated, and after being ground are seasoned and lapped round and straight, the sizes representing accurate subdivisions of the British Imperial yard or of the standard meter. Great care is taken in their manufacture, for upon them depends in a large measure the maintenance of an absolute standard. The sizes run from to 6 inches, or their equivalent in millimeters, with any subdivision of the inch or meter. Plug gauges up to 3 inches or 76 millimeters diameter are made solid. Above that, and up to 6 inches or 152 millimeters, they are hollow, thus reducing the weight. They are made of ample length and thickness, insuring strength and rigidity.

Prices of sizes by sixty-fourths, thirty-seconds, thousandths, or ten-thousandths of an inch, or varying by any other subdivision of an inch, or corresponding metric sizes, quoted upon application.

Plugs ordered separately, 40 per cent, and rings 60 per cent of above list prices for special cylindrical gauges. Sizes above 3 inches and for regular sizes in sets, in English or metric standards, quoted upon application. Standard or special sets sent securely packed in finished cherry cases, made especially for them. Regular sets are to 2 inches by sixteenths, and 2 to 3 inches by eighths, inclusive, plugs and templets.