Educational woodworking for home and school (1908)
Park, Joseph C · New York, MacMillan · leaf 162
hich is usedover a gas burner. In using this one must be ver> careful not to let the water in theouter boiler boil completelyaway and cause the glue tobe burned. Add water whenit is needed, for it boils awayrapidly. Wlien the gluereaches the right stage to beused, turn the gas under itvery low,… … 144 EDUCATIONAL WOODWORKING Fig. 146, or a contact glue heater, where the jacketcomes in contact with a steam heater ring, Fig. 147, < should be used for the sake of con- w venience and economy. The steam[i| can be taken from the heating plant, Hi which would be a saving of gas. With wL^^^ steam…
Manual training · Woodwork
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