A light glass formed on the surface of some lavas; used as an abrasive.
1 After this has dried, smooth it off with pumice stone and water.
2 And from that cloud showered these hot, pelting pebbles of pumice stone .
3 Rub into the periphery a paste of sifted powdered pumice stone and water.
4 But where a precious stone will take lustre a pumice stone will crumble.
5 There was yellow soap, a pumice stone , and carbolic soap, and scented soap.
6 It started as soapy fun, but was soon rubbing raw with a pumice stone .
7 French felt, medium hard, is used for rubbing down copal varnish with pumice stone .
8 Next morning, second coat rough-stuff, made with Reno's umber, fine pumice stone , japan, and turpentine.
9 For callous spots rub with pumice stone .
10 The last cone, all of crumbly pumice stone , and at a very acute angle, is tolerably tiring.
11 The walls were lined with a petrified sponge material resembling pumice stone , with thousands of regularly spaced indentations.
12 Do you not observe that there is no mould; that the island is composed entirely of pumice stone ?
13 A superficial and imperfect polish may be given by grinding for a short time with powdered pumice stone .
14 Heaps of pumice stone was noticed upon this beach; not any of this production had been met with floating.
15 These pieces of pumice stone are filled into a retort or chamber and the hot gases passed through them.
16 Sheets of zinc or of copper of a convenient size are carefully planished and polished with powdered pumice stone .
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